Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Me diga o número total de anos para a Lady Cecily Waynflete e a Opera House, Kennedy Center.
 ###Tabelas: CREATE TABLE results_by_club (results_by_club_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Wins INT, Runners-up INT, Years won VARCHAR, Years runner-up VARCHAR) CREATE TABLE all-time_top_scorers (all-time_top_scorers_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Player VARCHAR, Goals INT, Apps INT, Avg/Game INT) CREATE TABLE all_time_record (all_time_record_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Team Name VARCHAR, Games INT, Losses INT, Points INT) CREATE TABLE current_parks (current_parks_id AUTO_INCREMENT PRIMARY KEY, Park name VARCHAR, County or counties VARCHAR, Area in acres (ha) VARCHAR, Date founded INT, Stream(s) and / or lake(s) VARCHAR) CREATE TABLE theater_credits (theater_credits_id AUTO_INCREMENT PRIMARY KEY, Year INT, Play VARCHAR, Role VARCHAR, Theatre VARCHAR, Location VARCHAR)  
SELECT COUNT Year FROM theater_credits WHERE Role = lady cecily waynflete AND Theatre = opera house, kennedy center